Cooling system



y w. c. SEALEY 2,290,497

COOLING SYSTEM Filed June 6, 1940 //IIIIIIIIIIIIIIIIIIIIIlIIIIIIIIIII/IIIIIIIIIIIIIIIIIIA Patented July 21, 1942 NT OFFICE COOLING SYSTEM William O. Sealey, Wauwatosa,

Wis., assignor to Allis-Chalmers Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Application June 6, 1940, Serial No. 339,056

1 Claim.

This invention relates in general to cooling systems for encased apparatus and relates specifically to a cooling system for encased electrical apparatus provided with auxiliary means for providing a flow of air along radiating surfaces extending from the casing.

Casings for electrical apparatus, such as transformers immersed in insulating and cooling liquid, are provided with external radiators through which the liquid may flow to aid in the cooling thereof. The load capacity of such apparatus can be increased by increasing the heat transfer from these radiating surfaces by causing an additional flow of air across such surfaces. In the prior art, such additional flow or forced draft has been provided by motor operated fans forcing a current of air against the radiating surfaces. When such fans were utilized in the prior art constructions, the amount of floor space occupied by such apparatus was increased or a sacri fice in radiator length or casing height was made;

It is therefore an object of the present invention to provide an auxiliary cooling system for apparatus of the above type in which the auxiliary cooling apparatus is mounted in a manner which does not increase the floor space occupied by the apparatus.

It is another object of the present invention to utilize auxiliary cooling apparatus of the above type in a manner so that ratus casing is not increased.

It is a further object of the present invention to provide a compact arrangement for forced draft apparatus for radiators for encased transformers, whereby a maximum of radiator length can be utilized.

Objects and advantages other than those above described will be apparent from the following description when read in connection with the accompanying drawing, in which:

Fig. 1 is a front elevational view of a transformer utilizing the present invention; and

Fig. 2 is a partial section view taken on the line IIII of Fig. 1.

The invention as shown in the drawing is applied to a transformer having a casing I5 containing insulating and cooling liquid in which are immersed transformer elements including the windings IS. The transformer lead 2| is led through the cover N5 of the casing through a conventional bushing Is. In order to increase the radiating surface of the casing l5, a series of thin-walled radiating tubes 5 is connected to the top and bottom of the casing [5 by headers G which are bolted to the casing in a suitable manthe height of the appaner as by the flanges l. A flow of the liquid 20 through the radiator tubes 5 may be caused merely by thermal action or may be forced by a pump. Cooling of the liquid in the tubes 5 is caused by a natural draft of air circulating past the tubes 5.

In order to increase the load capacity of the transformer, apparatus for providing a forced draft of air is 'shown generally at 8. This apparatus consists in the present embodiment of a motor operated fan having a fan blade 9 of a length greater than the spacing between a radiator tube 5 on one header 6 and a similar tube 5 on the adjacent header 6. It is desirable to utilize a fan blade of this length in order to obtain the desired air flow between the individual tubes of a series connected to one header 6.

In order to provide for utilization of the fan assembly.8 without increasing the floor space necessary for the transformer, the fan assembly 8 is mounted under and between adjacent headers 6 and radiating tubes 5 as shown more clearly in Fig. 2. In order that be mounted in a manner so that additional height of the casing is unnecessary, the motor I0 or other operator for the fan blade 9 is positioned between the tubes 5 on adjacent headers as shown more clearly in Fig. 1. This permits utilization of the maximum radiator length (substantially from top to bottom of the casing) without increasing either floor space required or the height of the casing.

A housing l2 for the fan is supported by brackets l3 bolted underneath the headers 6, as shown in Fig. l. A screen l4 closes the entrance opening of the housing to foreign matter. The motor I0 is mounted on a spider ll supported in the housing l2 and is of a sufliciently small diameter to compactly fit in between the edges of radiating tubes 5 on adjacent headers. The blades 9 of the fan, mounted on the shaft of the motor H], are positioned between the headers 6, which permits them to be of a length sufficient to obtain the desired flow of air along the surfaces of the tubes 5. The energization of the motor [0 to provide for the additional flow of cooling air may be controlled manually or automatically to increase the load capacity of the transformer.

Utilization of the present invention not only provides a compactness which saves in height and floor space, but which also permits use of increased load capacity at a lower manufacturing cost.

Although but one embodiment of the present invention has been illustrated and described, it

the fan assembly 8 may substantially to the bottom thereof, a plurality of headers connecting the upper ends of said tubes to said casing, a plurality of headers connecting the lower ends of said tubes to said casing, means for providing a fiow of air along the entire length of said radiator tubes, said means comprising a fan blade of a length greater than said predetermined distance positioned between said lower headers, and a motor operator for 10 said fan blade positioned between said tubes.

WILLIAM C. SEALEY. 

